Quiz Recovery - Pure Substances & Mixtures

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Pure substances are made of only one kind of __________ and have definite chemical and physical properties.

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__________ cannot be broken down without losing their properties.

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___________ can break down into the elements that make them.

Multiple Choice

Select the BEST answer that compares compounds and elements.

• An element cannot be broken down without losing its properties, but a compound can be broken down into elements.

• An element can be broken into compounds, because compounds are the smallest unit of a substance.

• A compound is only composed of other compounds, and contains NO elements.

• A compound is the smallest unit of a substance that cannot be broken down further.

Multiple Choice

Which of the following is true regarding pure substances?

• ONLY pure elements can be pure substances not compounds.

• 25 mL of only liquid nitrogen is a pure substance.

• ONLY pure compounds can be pure substances not elements.

• Air, which contains nitrogen, oxygen, and carbon dioxide gas, is a pure substance made of only one type of molecule.

Multiple Choice

Look at the glass cup in the image. The substance inside the glass is an example of a ______________.

• Mixture

• Element

• Compound

Multiple Choice

Look at the glass cup in the image. The substance inside the glass is an example of a ______________.

• Mixture

• Element

• Compound

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A _________ is a combination of two or more substances that are combined physically but not chemically.

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A __________ mixture looks uniform throughout and our eyes cannot see the individual different components.

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A __________ mixture does not look uniform throughout and we can pick out the individual components.

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A __________ is a liquid homogeneous mixture.

Multiple Choice

Which of the following is true regarding a solution?

• A solution is ALWAYS a mixture.

• A solution is composed of a single compound.

• A solution CANNOT be a mixture.

• A mixture is ALWAYS a solution.

Multiple Choice

Which of the following is true regarding mixtures?

• Mixtures contain only a single type of compound or element.

• A glass of pure water is a mixture.

• Mixtures contain compounds and/or elements that can be separated.

• Mixtures cannot be separated because the different compounds are chemically combined in the mixture.

Multiple Choice

I am made of a gold necklace made up of only one type of atom (Au). What am I?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

Multiple Choice

I am a brick of dry ice (CO₂). What am I?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

Multiple Choice

I am a bowl of nachos with beans, rice, salsa, cheese, and tortilla chips. What am I?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture